Struct FrameStats 

pub struct FrameStats<const N: usize = 120> { /* private fields */ }

A fixed-size ring buffer of recent per-frame durations, plus the min/max/average/fps readouts derived from it.

N bounds memory and how far back the window looks; the default, 120 samples (about two seconds at 60fps), is a reasonable window for a live overlay. Every reducer (avg, min, max, fps) is computed on demand from the current window rather than maintained incrementally, since a live overlay only calls them once per rendered frame, not once per sample.

Readouts are Duration, not a pre-chosen unit: a caller formats with whatever precision it needs (as_millis(), as_secs_f32(), …) rather than being handed milliseconds it then has to convert back if it wants something else. current is the single most recent sample, unsmoothed: pair it with the windowed min/max for a “current, min, max” readout, and samples for a frame-time graph (feed it, converted to milliseconds, straight into Sparkline).

Implementations

impl<const N: usize> FrameStats<N>

pub const fn new() -> Self

An empty window; every readout is Duration::ZERO (or 0.0 for fps) until the first record.

pub fn record(&mut self, delta: Duration)

Records one frame’s wall-clock duration.

Call once per rendered frame with Frame::delta. A no-op if N is 0 (frame count still advances) rather than panicking: a zero-capacity window is a degenerate but harmless configuration, not a caller error worth crashing over.

pub const fn frame_count(&self) -> u64

Total frames ever recorded via record, uncapped by N.

pub fn samples(&self) -> impl ExactSizeIterator<Item = Duration> + '_

Recorded frame durations, oldest first (so the most recent frame is last): the order a sparkline/histogram wants so new data enters on the right.

pub const fn current(&self) -> Duration

The most recently recorded frame’s duration, unsmoothed. Duration::ZERO before the first record.

pub fn avg(&self) -> Duration

The average frame duration over the current window. Duration::ZERO before the first record.

pub fn min(&self) -> Duration

The fastest (shortest) frame in the current window. Duration::ZERO before the first record.

pub fn max(&self) -> Duration

The slowest (longest) frame in the current window. Duration::ZERO before the first record.

pub fn fps(&self) -> f32

Frames per second, derived from avg over the current window. 0.0 before the first record (rather than dividing by zero).

Trait Implementations

impl<const N: usize> Clone for FrameStats<N>

fn clone(&self) -> FrameStats<N>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<const N: usize> Debug for FrameStats<N>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<const N: usize> Default for FrameStats<N>

fn default() -> Self

Returns the “default value” for a type.